An exercise device with adjustable damping force has a main tube, an operating rod assembly slidably mounted on the main tube, an upper hole seat mounted on an upper end of the main tube and having multiple upper damping holes, a lower hole seat mounted on a lower end of the main tube and having multiple lower damping holes, at least one upper blocking element mounted on the upper hole seat, and at least one lower blocking element mounted on the lower hole seat. By adjusting an area where each upper damping hole is covered and an area where each lower damping hole is covered, the damping force provided by the exercise device as described can be adjusted according to different needs of users, and the exercise device is easy to carry and is versatile.

A pivot board exercise device has a top circular part may rotate in relation to a bottom circular part, and a unique unibody or complex multi-arm resistance mechanism is secured at its center to a rotational center platform of the top circular part, and is secured at the end of each arm to posts projecting from the bottom circular part. The unibody multi-arm resistance mechanism is a single piece of resilient/flexible material, the complex multi-arm resistance mechanism has multiple arms attached at the ends to the bottom part, so when the top of the invention is rotated relative to the bottom, resistance is offered, the resistance increasing with rotation and occurring regardless of the direction of rotation.

A unique full body exercise experience is provided by embodiments that produce user controlled resistance that can be assigned verbally, remotely by electronic means or manually. The embodiments can sense hand and foot location and then automatically change the resistance according to those locations, or by spoken word or programmed time. Exercise resistance can be offered in the three dimensions of space. Muscle groups can be exercised in complementary fashion with movements that fully stress the muscles. Two-movement exercises can be repeated endlessly or complicated ensembles in 3-space can be strung together, all with unlimited, user-defined changes of resistance. Every movement that is possible to perform with free weights or universal gyms is available to the user. Movements that are impossible with weights are easily performed with great safety. There has never been anything like this.

A pivot board exercise device has a top circular part that may rotate in relation to a bottom circular part, and a unique unibody or complex multi-arm resistance mechanism is secured at its center to a rotational center platform of the top circular part, and is secured at the end of each arm to posts projecting from the bottom circular part. The unibody multi-arm resistance mechanism is a single piece of resilient/flexible material, the complex multi-arm resistance mechanism has multiple arms attached at the ends to the bottom part, so when the top of the invention is rotated relative to the bottom, resistance is offered, the resistance increasing with rotation and occurring regardless of the direction of rotation.